Corey H via Postfix-users skrev den 2024-08-09 13:53:
Hello list,
I saw many logs like this in our server log,
Aug 9 19:48:27 mx postfix/submission/smtpd[3731732]: warning:
unknown[5.31.8.57]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Aug 9 19:48:27 mx postfix/submission/smtpd[3731732]: too many errors
after AUTH from unknown[5.31.8.57]
Since system has warned that "too many errors after AUTH ", is there a
policy setup to stop this kind of IP? i know fail2ban, but that's a
standalone service, not integrated into postfix itself.
https://www.spamrats.com/ best defense there see example conf for
postfix
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